Tubing set



Jan. 11, 1949. a ssET ET AL 'TUBING SET 'Filed Nov. 2, 1942 PatentedJan. 11, 1949' TUBING SET Naurice M. 'Nesset. Glenview, and Edward J.

Nawoj, Chicago, Ill., assignors to Baxter Laboratories, Ina, Glenview,111., a corporation of Delaware Application November 2, 1942, Serial No.464,300

9 Claims.

This invention relates to a tubing set, and more particularly to a jointor junction between glass tubing and flexible, collapsible,substantially inelastic tubing wherein the joint is watertight and thetubing may be readily sterilized and maintained in sterile condition.

An object of the invention is to attach flexible, collapsible,substantially inelastic tubing, such as Cellophane or the like, to glasstubing and to form a watertight joint which may be rendered sterile andmaintained in such condition. Another ob-- ject is to provide means forsecuring sterile tubing, which is substantially inelastic, to rigidglass or other tubing to form a watertight joint.

Yet another object of the invention is to provide a tubing set in whichglass or other rigid tubing is securely attached to tubing of an organicderivative of cellulose composition, such as Cellophane or the like.

Other features and advantages will appear from the followingspecification and drawings, in which- Fig. 1 is a side elevational viewof the tubing set; Fig. 2 is a fragmentary detail longitudinal sectionalview of the tubing set with the flexible tubing about to be secured inposition on the glass tubing; Fig 3 is a similar fragmentary detaillongitudinal sectional View of the tubing set with the flexible tubingsecurely attached to the glass tubing; and Fig. 4 is a longitudinalsectional View of the flexible tubing having an outwardly tapered endportion.

In the use of tubing sets where sterility is of importance, as inequipment for blood transfusion or for the handling of intravenoussolutions, it has heretofore been the practice to use rubber tubingwhich may be placed on glass tubing or glass equipment. Both the glassand rubber may be readily sterilized and maintained in sterile conditionand a watertight joint between the rubber and glass is maintained. Byreason of the elasticity of the rubber tubing, a watertight joint may beformed by merely passing the rubber tubing over a nipple on the end ofthe glass tubing.

Where rubber tubing is not available for this purpose, the problem ofproviding sterile flexible tubing which may be attached to glass to forma waterproof joint is a difiicult one. Such materials as the organicderivatives of cellulose compositions in the form of tubing may bereadily sterilized and maintained in sterile condition.- However, in thecase of tubing made of Cellophane or other organic derivatives ofcellulose composition, it'is extremely diflicult to securely attach the2 tubing to glass to form a watertight joint. If cement or adhesive isused for this purpose, the joint which is formed (of itself) will notsatisfactorily withstand the strains to which it is normally subjectedin use.

The present invention contemplates attaching flexible, substantiallyinelastic tubing to glass tubing by means of a joint which willwithstand severe strains and which is watertight. Thetubing set of theinvention may be readily sterilized and maintained in sterile condition.

In the embodiment of the invention described herein, a glass tube I0 isprovided with a reduced end I I. The reduced end H of the lass tube l0tapers slightly inwardly toward the end 12 of the tube. An annulargroove I3 extends transversely about an intermediate portion of thetapered end I l of the tube H].

The taper of the end portion ll of the tube I0 is slight and issubstantially uniform throughout at least the major portion of the endportion. As illustrated, .the taper is substantially uniform throughoutthe length of .the end portion II.

The glass tube is preferably equipped at the end portion H with a. thickwall [4 and a narrow passage [5 extending therethrough. The outersurface of the end portion ll of the tube Ill may be circular in crosssection shape and is substantially smooth except for the annular groove13 therein.

A tube I6 of Cellophane or the like is adapted to be received on thetapered end of the glass tube Ill. The tube I6 may be substantiallywaterproof and is flexible and collapsible. The tube is readilysterilized and may be easily maintained in sterile condition. TheCellophane tube It may be of substantially uniform diameter throughout.The internal diameter of the tubing should be substantially the same asthe external diameter of the end H of the glass tube H] at the portionlSadjacent the groove I3. The Cellophane tube l6 may be placed on the endll of the glass tube Ill and pressed on the glass tube until the end ofthe Cellophane tube reaches the portion ii) of the glass tube ID.

The tube l0' may be of any suitable type and may, in fact, be of anysuitable rigid material. Thus, instead of being made of glass, the tubeIn may be made of metal'or of a resinous material, such as acondensation or polymerization product. In the case of resinousmaterials, the material is preferably one which is transparent ortranslucent. For thepurpose of this invention, the construction of themain body of the glass tube is immaterial and is therefore not shown'lose, and benzyl cellulose.

"Cellophanetubing i6 and the glassfitube' in.

3 or described herein. In fact, the tube ill, if desired, may be only aprojecting portion of other equipment.

The tube It may be made of any suitable ma terial, but should beflexible and. readily sterilized and maintained in sterile condition.such tubing wilL-a1so be readily collapsible. The material of which thetube i may be composed includes organic derivatives of cellulosecomposition, such as Cellophane which consists of viscose or regeneratedcellulose, 01' cellulose acetatenor other organic esters of cellulose,or cellulose ethers. Examples of such organic esters of cellulose arecellulose formategce'l lulose propi'enate. and cellulose butyrate, while'e'xamples'oi cellulose others are ethyl cellulose, methyl cellu-D'th'er suitablelmatw rial, such as resinous condensation orpolymerization products, may also be used in the-tube i=8.

Thematerial of the tube is preferably substantially waterproof so thatwater 'solu'tions nray be readily passed through the "tubing-WitllGlll'. substantial loss orlealrage. In the-case of the thinCellophane tube 'l-'6, the tube will satisfactorily carry withoutsubstantial'loss or-leaka e a water solution, provided that in useofhydro staticheadof pressure on theinside of the tubing 'is onlymoderate. Itwill be understood that the term substantially waterproof'is'intendedto "cover such tubing as the Cellophane tubing through which=a-watersoiution may be passed '-withoutsubstantial loss or leakage.

sealing material, 'such'as a strip of "tape- 2 5, may 2.5;

be'wrappe-dtransversely about the tubing overlapping the end-ofthe-Cellophane tubing It and the adjacent portion of the glasstube lflpas illustratdin-Fig. 3. 'The' t'ape Z4 maybe'a pressure ressive,non-fibrous, "transparent tape of the conventional type-wherein "theadhesive consists "of a resinous or rubber baseyor. a mixture of thetwo, and provides a'watertightseal between the Any other suitablematerial'for providing a. "water "tightseal between'th'eCellophane andjglasstubing'mayibe used.

"If desired, a layer of .a suitable sealing material 'ma'ybe placed onthe outer surface of? the tapered end I! of. the glasstube i0.toazidiin' forming-a waterproof seal betweentheelasstube'and theCelloiphan'etubinglfi. This layer .of sealing material may be-appliedto: the glass v tube before the Cellophane tubing "i6 is placed inposition thereon. ..The Cellophanetube l 6 may bap'la'ced.in-.-position.over-thalayer of sealing material and may thenkbeisecured.in such positioniby fastening.a ..cord it about the same at the-portionthereof .overlying thegroove- T3. 'Thetightening ofthe cor-d -l8-causesthe flexible tube'JllG .to .be

drawn into. the-groove l.3,..and. the. secureattach- "ment of the.corcl: I8 inthis position-secures the tube t6 kagainst i longitudinalmovement with respect to the glass tube.

"Any '--suit'able type of "sealing wmaterial i may be .usedifortheradhesive-layerlfi. ;Preferably, the "materiarisfleXtblerwaridslightly plastic and, when disposed between the Cellophanetube and glass Normally,

4 tate may be dissolved in acetone and mixed with a small quantity of aplasticizing agent.

If desired, both the tape 2 and the layer of sealing material 25 may beused in forming the watertight seal. However, either of these sealingmeans may be eliminated. Preferably, the tape seal isused in any event.

With this construction, the Cellophane tube l6 and the glass tube it!are joined in watertight relation, and the use of the cord I8 in thegroove i3 securely attaches the Cellophane tube to the glass tube.Strains to which the joint may be subjected do not effect the seal sincethe glass and Gllophanetubing cannot be moved longitudinally withrespect to each other.

Any suitable means may be used for securing the-cellophane tube with thegroove iii in the \an d tube I6 overlying the groovelS which receivesthe cord.

"If desired, the Cellophane tube, as illustrated in Fig. 4, may beoutwardly'tapered near the end thereof, the taper being substantiallythe same as the in-ward taper .onthe end ii of the glass tube. inthisevent, the body portion 22 of the tube 2-l may "be substantiallyuniform in "diameter, the diameter of the body portion '22 'beingthesa-me as that of the endof the glass tube.

'The endportionit 'is outwardly tapered and is adapted to be receivedonthe end H of the glass In the caseof this construction, the tubing 2lispl-ace'd over theend ll of the glass tube and ispressedcn the glasstube until it tightly engages the same.

preferably tubular and, as illustrated,'both tubes "may-besubstantially-circularin cross section.

However, the cross section shape 'zmay'be ofany tubulariorm inwhichsubstantially all'portions "ofthe cross sectional periphery arearcuate in contour.

Although the invention has been described in connection with specificembodiments, it will be understood that'such description is'for thepurpose of illustration only. Changes and. modifications, thereforeymaybe readily "made Without departing'irom the spirit and scope of theinvention.

"We claim:

'1. A tubing set for transmittingliquids, com- .rising.a..r.igid tubehaving -.a groove extending .transverselyabout the periphery of .anintermediate portion of the end thereof and Ya thin flexible,substantially inelastic .tube received snugly aboutlsaidtend of therigid tube andoverlying'ithe groove therein, the-end of said rigid 'tubetbaving a longitudinaldimensionally constant peripheral surfaceextending 'thereabout adjacent saidgroove, receiving the inelastic tubetudinal movement of the tubes with respect to each other.

2. A tubing set for transmitting liquids, comprising a glass tube havingat one end a slight narrowing taper toward the end thereof, said tubehaving a groove extending transversely about the periphery of anintermediate portion of the tapered end, and a thin, flexible,collapsible, substantially waterproof and inelastic tube of internaldiameter substantially the same as the external diameter of said taperedend adjacent said groove received snugly about said tapered end of theglass tube and overlying the groove therein, the end of said rigid tubehaving a longitudinal dimensionally constant peripheral surfaceextending thereabout adjacent said groove, receiving the inelastic tubein snug peripheral engagement therewith and means extending transverselyabout said inelastic tube and overlying said groove in said glass tubeto secure the inelastic tube Within the groove and prevent longitudinalmovement of the tubes with respect to each other.

3. A tubing set for transmitting liquids, com prising a glass tubehaving at one end a narrowing taper toward the end thereof, said tubehaving a groove extending transversely about the periphery of anintermediate portion of the tapered end, a thin, flexible, collapsible,substantially waterproof and inelastic tube received snugly about saidtapered end of the glass tube and overlying the groove therein, the endof said rigid tube having a longitudinal dimensionally constantperipheral surface extending thereabout adjacent said groove, receivingthe inelastic tube. in snug peripheral engagement therewith a sealingmaterial providing a substantially watertight seal between said tubes,and means extending transversely about said inelastic tube and overlyingthe groove in said glass tube to secure the inelastic tube within thegroove and prevent longitudinal movement of the tubes with respect toeach other.

4. A tubing set for transmitting liquids, comprising a glass tube havingat one end a slight narrowing uniform taper toward the end thereof, saidtube having a groove extending transversely about the periphery of anintermediate portion of the tapered end, a thin, flexible, collapsible,substantially waterproof and inelastic tube of internal diametersubstantially the same as the external diameter of said tapered endadjacent the groove therein received snugly about said tapered end ofthe glass tube, the end of said rigid tube having a longitudinaldimensionally constant peripheral surface extending thereabout adjacentsaid groove, receiving the inelastic tube in snug peripheral engagementtherewith a sealing material providing a watertight seal between saidtubes, and filamentary means extending transversely about said inelastictube and overlying said groove to secure the inelastic tube within thegroove and prevent longitudinal movement of the tubes with respect toeach other.

5. A tubing set for transmitting liquids, comprising a glass tube havingat one end a narrowing taper toward the end thereof, said tubing havinga groove extending transversely about the periphery of an intermediateportion of the tapered end, and a thin, flexible, collapsible, substantially waterproof and inelastic tube of an organic derivative ofcellulose composition received snugly about said tapered end of theglass tube and overlying the groove therein, the end of said rigid tubehaving a longitudinal dimensionally constant peripheral surfaceextending thereabout adjacent said groove, receiving the inelastic tubein snug periperal engagement therewith and means extending transverselyabout said inelastic tube and overlying said groove to secure saidinelastic tube within the groove and prevent longitudinal movement ofthe tubes with respect to each other.

6. A tubing set for transmitting liquids, comprising a glass tube havingat one end a slight narrowing uniform taper toward the end thereof, saidtube having a groove extending transversely about the periphery of anintermediate portion of the tapered end, a thin Cellophane tube of asubstantially uniform diameter, the internal diameter beingsubstantially the same as the external diameter of said tapered endadjacent said groove, said Cellophane tube being received snuglyaboutsaid tapered end of the glass tube, the end of said rigid tubehaving a longitudinal dimensionally constant peripheral surfaceextending thereabout adjacent said groove, receiving the inelastic tubein snug peripheral engagement therewith a strip of sealing tapeextending about the junction between said tubes providing asubstantially watertight joint therebetween, and filamentary meansextending transversely about said inelastic tube and overlying thegroove therein to secure the inelastic tube within said groove andprevent longitudinal movement of the tubes with respect to each other.

'7. A tubing set for transmitting liquids, comprising a glass tubehaving at one end a slight narrowing uniform taper toward the endthereof, said tube having a groove extending transversely about theperiphery of an intermediate portion of the tapered end, a thinCellophane tube having a slight outward taper at one end thereof, thebody of the Cellophane tube being of an internal diameter substantiallythe same as the external diameter of the end of the glass tube adjacentsaid groove and the tapered portion of the Cellophane tube having ataper substantially the same as the taper on the end of the glass tube,the end of said rigid tube having a longitudinal dimensionally constantperipheral surface extending thereabout adjacent said groove, receivingthe inelastic tube in snug peripheral engagement therewith, the taperedportion of the Cellophane tube being snugly received about the taperedend of the glass tube and overlying the groove therein, a sealingmaterial between the tapered ends of said tubes for securing awater-tight seal therebetween, and a cord extending transversely aboutsaid Cellophane tube and overlying said groove, said cord being drawntight to secure the Cellophane tube within the groove and preventlongitudinal movement of the tubes with respect to each other.

8. A tubing set for transmitting liquids. comprising a glass tube havingat one end a narrowing taper toward the end thereof, said tube having agroove extending transversely about the periphery of an intermediateportion of the tapered end, a thin, flexible, collapsible, substantiallywaterproof and inelastic tube received snugly about said tapered end ofthe glass tube and overlying the groove therein, the end of said glasstube having a longitudinal, dimensionally, constant peripheral surfaceextending thereabout adjacent said groove receiving the inelastic tubein snug peripheral engagement therewith, a sealing material providing asubstantially watertight seal between the tubes, means extendingtransversely about said inelastic tube and overlying the groove; in saidglass tube; to secure. the

inelastic tube Within the groove and prevent longitudinal movement ofthe tubes with. respect to each other, and tape means adhesivelyconnecting portions of the inelastic tube adjacent that secured withinthe groove to prevent longitudinal forces from effecting displacement ofthat portion secured within the groove.

9. A tubing set for transmitting liquids, comprising a glass tube havingat one end a slight narrowing uniform taper toward the end thereof, saidtube having agroove extending transversely to the periphery ofanintermediate portion of the tapered end, a thin Cellophane tube havinga slight outward taper at one end thereof, the 7 body of the Cellophanetube being of? a uniform internal diameter substantially the same as theexternal diameter of the end of the glass tube adjacent said groove andthe tapered portion of the Cellophane having a taper substantially thesame as the taper of the end of the glass tube, the end of said glasstube having a longitudinal, dimensionally constant peripheral sur-- faceextendingthereabout adjacent said groove receiving the Cellophane tubein snug peripheral engagement therewith, the tapered portion of theCellophane tube-being snugly received to the tapered end of the glasstube and overlying the groove therein, sealing material between thetapered ends of said tubes for securing a Watertight-seal there-between,a cord extending transversely about said Cellophane tube and overlyingsaid groove, said cord being drawn tight to secure the Cellophane tubeWithin the groove and prevent longitudinal movement of the tubes withrespect to each other and a binding tape extending transversely aboutsaid Cellophane tube to connect the tube in the regions adjacent thatsecured within the groove causing the tube to retain the rib-likerelation seated Within the groove.

NAURICE M. NESSET.

EDWARD J. NAWOJ.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 50,398 Smith Oct. 10, 1865144,163 Taylor Oct. 28, 1873 796,114 Currey Aug. 1, 1905 1,067,202Stacey July 8, 1913 1,251,086 Morgan Dec. 25, 191? 1,678,640 Hall July31, 1928 $014,441 Matthews Sept. 17, 1935 2,143,279 Osborn Jan. 10, 19392,198g996 Guarnaschell' Apr. 30, 1940 2,237,221 Flynn Apr. 1, 1941

